Messages in this thread | | | Date | Fri, 5 Aug 2011 20:22:13 +0100 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH RFC v1] ARM: olpc: Add support for calling into the XO-1.75's OpenFirmware (OFW) |
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On Thu, Aug 04, 2011 at 04:25:51PM -0700, Andres Salomon wrote: > Add support for saving OFW's cif, and later calling into it to run OFW > commands from the kernel. OFW remains resident in memory after boot, > and the physical/virtual addresses are passed in a boot tag.
If you have open firmware, then you probably have a device tree being passed to the kernel. In that case, there aren't any boot tags being passed. So I think this patch is rather inconsistent.
Also I believe we had decided that ARM is not going to support the runtime bits of DT/open firmware stuff. Unless open firmware is aware of the setup of the kernel mappings (which would then tie it directly to the running kernel) it can't access any hardware resources. I'm not willing to have external binary blobs (whether or not the source is available) having a dependency on the setup of the kernel page tables. Given that we are consolidating across all platforms, it's likely that we will want to change the virtual address layout over time and to have some external binary blob is just going to be a complete nightmare.
So I really don't like this idea. At all.
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